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3.
Precautions in Operation
Depressing of Keys
Depress
the
keys accurately. I
f
two
keys
are de-
pressed simultaneously, the overflow lamp lights.
Key
0
peration
For right hand
operation,
place the
ind
ex
finger
on
the
key
0
,
the middle finger
on
the key
~
and
the th ird finger on
the
key
0 .
Make a
habit
of
keeping your
fingers in these
position
s. Thus,
depress
the left
column
keys
C2J
0
~
with
the index
finger, the middle column keys
0
~
0
with the
middle
finger, and the right
column keys
13'
0
o
with
the
third
finger.
With
practice,
blind
operation will soon
become
possible.
Notes:
1)
Always
depress the
~
key
after
randam
opera-
t
ion.
2
)
Remove
the cover during operation, and
take
care
not to block the
ventilation holes at
the top
and
bottom of the calculator.
3)
Do not use the calculator in direct
sunlight.
7
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